<p>Converts block references, polylines, splines, ellipses, texts, dimensions
and hatches into more basic entities. Dimensions are split up into lines,
triangles and text entities. Text entities are split into polylines (or lines,
arcs and splines). Splines are converted into polylines with tangentially
connected arc segments. Ellipses are converted into polylines with arc
segments. Polylines are split up into loose segments. Hatches are split up into
lines. Solid fills are converted to the outline of the solid fill.</p>
